Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH] [24/50] x86_64: Eliminate result signage problem in asm-x86_64/bitops.h | Date | Sat, 22 Sep 2007 00:32:23 +0200 (CEST) |
| |
From: Chuck Lever <chuck.lever@oracle.com> The return type of __scanbit() doesn't match the return type of find_{first,next}_bit(). Thus when you construct something like this:
boolean ? __scanbit() : find_first_bit()
you get an unsigned long result if "boolean" is true, and a signed long result if "boolean" is false.
In file included from /home/cel/src/linux/include/linux/mmzone.h:15, from /home/cel/src/linux/include/linux/gfp.h:4, from /home/cel/src/linux/include/linux/slab.h:14, from /home/cel/src/linux/include/linux/percpu.h:5, from /home/cel/src/linux/include/linux/rcupdate.h:41, from /home/cel/src/linux/include/linux/dcache.h:10, from /home/cel/src/linux/include/linux/fs.h:275, from /home/cel/src/linux/fs/nfs/sysctl.c:9: /home/cel/src/linux/include/linux/nodemask.h: In function â__first_nodeâ: /home/cel/src/linux/include/linux/nodemask.h:229: warning: signed and unsigned type in conditional expression /home/cel/src/linux/include/linux/nodemask.h: In function â__next_nodeâ: /home/cel/src/linux/include/linux/nodemask.h:235: warning: signed and unsigned type in conditional expression /home/cel/src/linux/include/linux/nodemask.h: In function â__first_unset_nodeâ: /home/cel/src/linux/include/linux/nodemask.h:253: warning: signed and unsigned type in conditional expression
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Andi Kleen <ak@suse.de>
---
include/asm-x86_64/bitops.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux/include/asm-x86_64/bitops.h =================================================================== --- linux.orig/include/asm-x86_64/bitops.h +++ linux/include/asm-x86_64/bitops.h @@ -260,7 +260,7 @@ extern long find_first_bit(const unsigne extern long find_next_bit(const unsigned long * addr, long size, long offset); /* return index of first bet set in val or max when no bit is set */ -static inline unsigned long __scanbit(unsigned long val, unsigned long max) +static inline long __scanbit(unsigned long val, unsigned long max) { asm("bsfq %1,%0 ; cmovz %2,%0" : "=&r" (val) : "r" (val), "r" (max)); return val; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |